5CNP

X-ray crystal structure of Spermidine n1-acetyltransferase from Vibrio cholerae.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.38 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.185 
  • R-Value Observed: 0.188 

wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

Substrate-Induced Allosteric Change in the Quaternary Structure of the Spermidine N-Acetyltransferase SpeG.

Filippova, E.V.Weigand, S.Osipiuk, J.Kiryukhina, O.Joachimiak, A.Anderson, W.F.

(2015) J Mol Biol 427: 3538-3553

  • DOI: 10.1016/j.jmb.2015.09.013
  • Primary Citation of Related Structures:  
    4JLY, 5CNP, 4YGO

  • PubMed Abstract: 
  • The spermidine N-acetyltransferase SpeG is a dodecameric enzyme that catalyzes the transfer of an acetyl group from acetyl coenzyme A to polyamines such as spermidine and spermine. SpeG has an allosteric polyamine-binding site and acetylating polyamines regulate their intracellular concentrations ...

    The spermidine N-acetyltransferase SpeG is a dodecameric enzyme that catalyzes the transfer of an acetyl group from acetyl coenzyme A to polyamines such as spermidine and spermine. SpeG has an allosteric polyamine-binding site and acetylating polyamines regulate their intracellular concentrations. The structures of SpeG from Vibrio cholerae in complexes with polyamines and cofactor have been characterized earlier. Here, we present the dodecameric structure of SpeG from V. cholerae in a ligand-free form in three different conformational states: open, intermediate and closed. All structures were crystallized in C2 space group symmetry and contain six monomers in the asymmetric unit cell. Two hexamers related by crystallographic 2-fold symmetry form the SpeG dodecamer. The open and intermediate states have a unique open dodecameric ring. This SpeG dodecamer is asymmetric except for the one 2-fold axis and is unlike any known dodecameric structure. Using a fluorescence thermal shift assay, size-exclusion chromatography with multi-angle light scattering, small-angle X-ray scattering analysis, negative-stain electron microscopy and structural analysis, we demonstrate that this unique open dodecameric state exists in solution. Our combined results indicate that polyamines trigger conformational changes and induce the symmetric closed dodecameric state of the protein when they bind to their allosteric sites.


    Organizational Affiliation

    Center for Structural Genomics of Infectious Diseases, Feinberg School of Medicine, Department of Biochemistry and Molecular Genetics, Northwestern University , Chicago, IL 60611, USA. Electronic address: wf-anderson@northwestern.edu.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Spermidine N(1)-acetyltransferaseABCDEF176Vibrio cholerae O1 biovar El Tor str. N16961Mutation(s): 0 
Gene Names: speGVC_A0947
EC: 2.3.1.57
Find proteins for Q9KL03 (Vibrio cholerae serotype O1 (strain ATCC 39315 / El Tor Inaba N16961))
Explore Q9KL03 
Go to UniProtKB:  Q9KL03
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
IPA
Query on IPA

Download CCD File 
A, E
ISOPROPYL ALCOHOL
C3 H8 O
KFZMGEQAYNKOFK-UHFFFAOYSA-N
 Ligand Interaction
MG
Query on MG

Download CCD File 
B, D, F
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A,B,C,D,E,FL-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.38 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.185 
  • R-Value Observed: 0.188 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 159.931α = 90
b = 134.176β = 114.43
c = 77.477γ = 90
Software Package:
Software NamePurpose
HKL-2000data scaling
REFMACrefinement
PDB_EXTRACTdata extraction
HKL-2000data reduction

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)United StatesHHSN272200700058C
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)United StatesHHSN272201200026C

Revision History 

  • Version 1.0: 2015-07-29
    Type: Initial release
  • Version 1.1: 2015-10-07
    Changes: Database references
  • Version 1.2: 2015-11-11
    Changes: Database references
  • Version 1.3: 2017-09-20
    Changes: Author supporting evidence, Database references, Derived calculations
  • Version 1.4: 2019-12-11
    Changes: Author supporting evidence